JPH01136263A - System for managing communication control buffer - Google Patents

Abstract

PURPOSE:To use a common buffer area without lowering processing efficiency in data transfer by performing the data transfer between layers by transferring the managing right of the buffer area as leaving data stored in the buffer area as it is. CONSTITUTION:In transmission, a communication control program of high-order layer starts up a data generating means 19 to perform the transmission. The data generating means 19 requests the buffer area to a buffer acquiring means 12. The buffer acquiring means 12 searches a null buffer from a buffer area group. The data generating means 19 stores transmission data in the data storage area 22 of the buffer, and requests data transmission to a low-order transmission means 16. The transmission means 16 informs the buffer are where the transmission data is stored to a low-order layer. The communication control program of low-order, when accepting a transfer request from the high-order layer by a high-order acceptance means 15, requests the re-acquirement of the buffer to a buffer re-acquiring means 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a computer system that executes a hierarchical communication procedure.

〔overview〕

In a communication control buffer management method comprising a program control means and a plurality of buffer areas, a buffer management information area is defined for each of the buffer areas, and a number corresponding to the layer in which the buffer area is managed is added, Furthermore, by transferring data between layers by transferring the management rights of the buffer area in which data is stored, processing efficiency and storage efficiency are improved, and buffer release control is made easier.

[Conventional technology]

Conventionally, in computer systems that execute layered communication protocols such as the International Organization for Standardization's (ISO) Open System Interconnection (O3I), communication control programs that execute communication procedures for each layer are individually stored in buffer areas. When receiving and passing data from a communication control program running one layer to a communication control program running another layer, a common method is to transfer data between those buffer areas.

Additionally, in some systems and parts of the system, a method is used in which the buffer area is shared between communication control programs in each layer, and only the buffer address is passed to the other program without data transfer. However, the only operations on the buffer area were acquisition and release operations.

[Problem that the invention seeks to solve]

The conventional buffer management methods for communication control described above each have the following problems.

In a method in which each communication control program has a buffer area and data is transferred between programs, processing efficiency deteriorates due to buffer transfer, and - sometimes the buffer area of multiple communication control programs is the same. data will exist, and storage efficiency will also deteriorate.

In addition, in a method in which a buffer is shared between communication control programs that execute each layer and only the buffer address is passed to the other program, the only operations on the buffer area are acquisition and release operations, so one program can release the buffer area. When doing so, there is a problem in which relationships with other programs must be considered.

In particular, when multiple routes can be selected in the lower layer, such as in the O3I transport layer, and the same data is retransmitted in both the lower and upper layers, the retransmission process in the lower layer cannot be completed with just an acceptance response from the other party. I can't tell if it's finished or not.

Therefore, the buffer area must be released when both the transmission completion notification from the lower layer and the acceptance response from the partner system are received, which complicates control.

The present invention improves on this, and aims to provide a communication control buffer management method that improves processing efficiency and storage efficiency, and facilitates control of buffer release.

[Means for solving problems]

A buffer management information area for managing the usage status of each buffer area is defined, and the program control means for each layer in the layered procedure transfers data between layers while the data is stored in the buffer area. The present invention is characterized in that it includes means for performing the execution by transferring the management right of the area, and means for adding a number corresponding to the layer that manages the buffer area to the buffer management information area.

[For production]

Data transfer between layers does not transfer buffers, but rather transfers management rights for the buffer area while data is stored in the buffer area, and does not release the buffer until it is no longer needed in all layers of communication control. There is no need for data transfer that reduces processing efficiency.

Furthermore, since a common buffer is used in each layer, storage efficiency is improved.

Furthermore, by adding a number corresponding to the layer that manages the buffer area to the buffer management information area, the communication control program of each layer can independently know and control the usage status of the buffer, making it easier to release complex buffers. Waiting control becomes unnecessary.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

Figure 1 is a diagram showing the position of the communication control device in the whole, Figure 2
3 shows an embodiment of the present invention, FIG. 3 is a diagram for explaining the buffer management information area 21, FIG. 4 is a flowchart for explaining the detailed operation of the buffer acquisition means 12, and FIG. 6 is a flowchart for explaining the detailed operation of the buffer reacquisition means 13, and FIG. 6 is a flowchart for explaining the detailed operation of the buffer release means 14.

In FIG. 1, a communication control device 1 communicates with a host CPU 2, is accompanied by a memory device 3, is connected to other systems via lines, and communicates according to a hierarchical communication procedure.

Referring to FIG. 2, the communication control device 1 includes a buffer management section and a communication control section. The buffer management section and the communication control section include program control means for each layer that controls each layer of the hierarchical procedure. The buffer management section first has a buffer area group 11, which consists of a plurality of buffer areas, each buffer area has a buffer management information area 21 for managing its usage status, and a data storage area for storing data to be sent and received. I have 22.

As shown in FIG. 3, the buffer management information area 21 has the same function as a buffer in use flag 31 indicating whether the buffer is being used or not, as a means of adding a number corresponding to the layer to be managed. Buffer acquisition count field 32 indicating how many acquisition requests have been made to the buffer
Equipped with. The layer-by-layer program control means is configured to transfer data between layers by transferring the management right of the buffer area while data is stored in the buffer area.

Furthermore, the buffer management section includes a buffer management information area 21.
a buffer acquisition unit 12 that acquires an unused buffer area from the buffer area group 11 and sets the buffer acquisition count to 1 as means for adding a number corresponding to the layer that manages the buffer area to the buffer area; Buffer reacquisition means 13 increases the number of buffer acquisitions in a designated buffer area by 1, and decreases the number of buffer acquisitions in the designated buffer area by 1, and when the number of buffer acquisitions reaches 0, the buffer area is in an unused state. Buffer release means 14 to
There is.

Further, the communication control unit is composed of multiple layers. One layer includes a data generation means 19 that requests a buffer area from the buffer acquisition means 12, an upper reception means 15 that accepts a transfer request from an upper layer, and a notification of a buffer area in which transmission data is stored to a lower layer. It consists of a lower transmitting means 16, a lower receiving means 17 for receiving and receiving a buffer area from the lower layer, and an upper notifying means 18 for notifying the upper layer.

First, the transmission operation will be explained.

The data generation means 19 is activated in order for a certain upper layer communication control program to perform transmission. The data generation means 19 requests a buffer area from the buffer acquisition means 12.

The buffer acquisition means 12 searches the buffer area group for a buffer area in which the buffer in use flag 31 is OFF, as shown in FIG. 3, for example (step 401).

If there is a buffer whose buffer in use flag 31 is off, turn on the buffer in use flag 31 and set 1 in the buffer acquisition count field 32 (step 402).
, and notify the requester of the buffer address in step 403.
), if there is no buffer with the buffer in use flag 31 off, the requester is notified that the buffer could not be obtained (step 404).

When the data generation means 19 obtains a buffer area, it stores the transmission data in the data storage area 22 of the buffer area, and requests the lower transmission means 16 to transmit the data to the lower layer. If a buffer area cannot be obtained, processing such as requesting acquisition of a buffer area after a certain period of time is performed.

The lower transmission means 16 notifies the lower layer of the buffer area in which the transmission data is stored according to the agreement with the lower layer. In the lower-level communication control program, when the upper-level reception means 15 accepts a transfer request from the upper layer, it requests the buffer re-acquisition means 13 to re-acquire the buffer. The buffer reacquisition means 13 adds 1 to the buffer acquisition count field 32 of the designated buffer area, as shown in FIG. 4, for example (step 501).

After the reacquisition of the buffer is completed, the upper receiving means 15 adds communication control information according to the communication procedure to the data and requests the lower transmitting means 16 to transmit the data to the lower layer.

In this way, communication data generated in a certain layer is stored in the buffer area, and is transmitted to the communication line with the buffer acquisition count field 32 equal to the number of the layer.

Next, the reception operation will be explained.

In order to receive data, the lowest layer requests the buffer acquisition means 12 to acquire a buffer area.

The operation of the buffer acquisition means 12 is as described in the explanation of the transmission operation, and the buffer acquisition number field 32 of the acquired buffer area is set to 1.

When data is received in the acquired buffer area, the lower receiving means 17 of the lowest layer analyzes the received data.

If the received data is an acknowledgment for the transmitted data, the buffer release means 14 indicates that the buffer area in which the acknowledgment is stored and the buffer area in which the transmitted data is stored are no longer needed in that layer. Notice.

For example, as shown in FIG. 5, the buffer release means 14 subtracts 1 from the buffer acquisition count field 32 of the designated buffer area (step 601), and determines whether the buffer acquisition count field 32 has become 0 (step 601). Step 602). If the buffer acquisition count field 32 becomes 0, turn off the buffer in use 7 lag 31,
The buffer area is made unused (step 603).

If the buffer acquisition count field 32 does not become 0, nothing is done here. In other words, no release is performed.

If the data received by the lower receiving means 17 is a negative response that requires retransmission of the transmitted data, it requests the lower transmitting means 16 to retransmit the transmitted data in a buffer area. The buffer area in which the negative response is stored is requested to be released by the buffer release means 14. If it is necessary to generate new transmission data from the data received by the lower receiving means 17, the data generating means 19 is requested to generate the data. The operation of the data generation means 19 is as explained in the transmission operation.

If the received data is data that should be notified to an upper layer, the upper layer notification means 18 is requested to notify the upper layer. At this time, unnecessary communication control information is deleted. In the upper layer, the received data is accepted by the lower receiving means 17 and processed in the same way.

In this way, the buffer acquisition count field 32 of the buffer area in which received data is stored always operates at 1, and is immediately released when it is no longer needed.

The buffer acquisition count field 32 of the buffer area in which transmission data is stored maintains the number of layers at the time of transmission even after transmission is completed, and is decremented by 1 each time each layer is determined to be unnecessary.
Buffer space is not freed until it is no longer needed in all layers.

Although the buffer management information area exists within the buffer area, the same effect can be obtained even if the buffer area group and the buffer management information area are separated.

〔Effect of the invention〕

As described in detail above, according to the present invention, a common buffer area is used without reducing processing efficiency during data transfer, resulting in improved storage efficiency.

Furthermore, complicated buffer release waiting control becomes unnecessary.

INDUSTRIAL APPLICATION This invention is extremely effective when used for the buffer management method of the computer system which executes a layered communication procedure.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the position of a communication control device in the whole. FIG. 2 is a diagram showing an embodiment of the present invention. FIG. 3 is a diagram for explaining the buffer management information area. FIG. 4 is a flowchart for explaining the detailed operation of the buffer acquisition means. FIG. 5 is a flowchart for explaining the detailed operation of the buffer reacquisition means. FIG. 6 is a flowchart for explaining the detailed operation of the buffer release means. 1... Communication control device, 2... Upper CPU, 3...
Memory device, 11... Buffer area group, 12... Buffer acquisition means, 13... Buffer re-acquisition means, 14
...Buffer release means, 15...Upper reception means, 1
6...Lower transmitting means, 17...Lower receiving means, 18
...Upper notification means, 19...Data generation means, 21
...Buffer management information area, 22...Data storage area,
31... Buffer in use flag, 32... Buffer acquisition count field, 401 to 404.501.601
~603... Step of flowchart.

Claims (1)

[Claims] (1) Equipped with a communication control device that communicates with other systems using a layered communication procedure, and this communication control device sends and receives information to and from program control means for each layer that controls each layer of the layered procedure. In a management method for a communication control buffer including a plurality of buffer areas for temporarily storing data, a buffer management information area for managing the usage status of each of the buffer areas is defined, and the program control means for each layer includes: Means for performing data transfer between layers by transferring the management right of the buffer area while data is stored in the buffer area, and a number corresponding to the layer that manages the buffer area in the buffer management information area. 1. A communication control buffer management method, comprising: adding means.